Portion of an article of footwear



FIG. 1 is a bottom perspective view of a portion of an article of footwear showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

The broken lines showing a footwear upper and periphery in FIGS. 1-6 represent the portions of the design that form no part of the claim. The outermost broken line forming an oval shape in FIGS. 1 & 2 defines the interior boundary of the design. The broken line and the area within, form no part of the claim. 

The ornamental design for a portion of an article of footwear, as shown and described. 